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GATE BT-2017 Answer Key | Solutions Discussion
It was a classical case of zero order kinetics:

Concentration left at any time, t = -kt + Initial concentration

So that, 0 = -kt + 0.1
ie t = 0.1/1000 = 100 mins


The problem with unitary method is very interesting though ( something that will fetch you all some marks on this question).

A zero order reaction can easily be approached using a unitary method (provided the question setter stays alert in keeping all the units in sync). This time they messed with the unit of k (by giving its unit as mol per min) whereas in a zero order reaction, k is supposed to be mol per litre per min or say concentration per minute).

So, it's a mistake at examiner's end in giving wrong units for the reaction constant. Those who used classical formulas got the right answer, but those who were more analytical in this question ended up on the wrong road.

In my view, both the 100 and 10,000 are are right answers in students' perspective, the mistake is at examiner's end.
(03-01-2017, 06:09 PM)sadaf188 Wrote:
(03-01-2017, 06:01 PM)travellingsalesman Wrote: Nope. Its a different question. Same answer!
[Image: 585_217875_0_587434_r_bt_q49.jpg]

[Image: 585_217875_0_587434_r_bt_q43.jpg]
Yes the question is....a zero order kinetics.......

If we follow even simple unitary method also then...
1min........10^-3 moles consumed
100min....0.1 moles consumed
Whereas conc of A is 0.1moles/liter....so for 100litre its is 0.1*100=10 moles.
So for 10 moles...10000 min are required
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
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(03-01-2017, 05:27 PM)SunilNagpal Wrote:
(03-01-2017, 04:46 PM)sadaf188 Wrote: Plz anyone try ques 49 also its answer is given 100 in answer key...mine is 10000 minutes
Is the following link addressing the same question?
http://www.biotechnologyforums.com/showt...0#pid11610

If not, could you please post the question(s)?

Or if someone could post the question sheet as well as official answer key?
Sir, You can find both the question and answer key from the below link

http://gate.iitr.ernet.in/?page_id=604
can it be challenged?
(03-01-2017, 08:38 PM)Santhosh Ram Wrote: can it be challenged?
Yes it can be challenged
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
Top Biotech Companies | Top places to work
Indian Biotech Companies and Job Openings
Aiming a PhD in Top Grad School? | These are the Important Points to Consider
Careers in Biotechnology | A list of various Options
Biotechnology Competitive Exams in India
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